Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/g1/heapRegion.hpp @ 5541:b4c406861c33
More renamings to drop Ri* prefix completely. Deleted graph.BitMap class and replaced with java.util.BitSet.
author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
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date | Sat, 09 Jun 2012 16:52:12 +0200 |
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342 | 1 /* |
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2 * Copyright (c) 2001, 2012, Oracle and/or its affiliates. All rights reserved. |
342 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
342 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |
26 #define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP | |
27 | |
28 #include "gc_implementation/g1/g1BlockOffsetTable.inline.hpp" | |
29 #include "gc_implementation/g1/g1_specialized_oop_closures.hpp" | |
30 #include "gc_implementation/g1/survRateGroup.hpp" | |
31 #include "gc_implementation/shared/ageTable.hpp" | |
32 #include "gc_implementation/shared/spaceDecorator.hpp" | |
33 #include "memory/space.inline.hpp" | |
34 #include "memory/watermark.hpp" | |
35 | |
342 | 36 #ifndef SERIALGC |
37 | |
38 // A HeapRegion is the smallest piece of a G1CollectedHeap that | |
39 // can be collected independently. | |
40 | |
41 // NOTE: Although a HeapRegion is a Space, its | |
42 // Space::initDirtyCardClosure method must not be called. | |
43 // The problem is that the existence of this method breaks | |
44 // the independence of barrier sets from remembered sets. | |
45 // The solution is to remove this method from the definition | |
46 // of a Space. | |
47 | |
48 class CompactibleSpace; | |
49 class ContiguousSpace; | |
50 class HeapRegionRemSet; | |
51 class HeapRegionRemSetIterator; | |
52 class HeapRegion; | |
2152 | 53 class HeapRegionSetBase; |
54 | |
3766 | 55 #define HR_FORMAT SIZE_FORMAT":(%s)["PTR_FORMAT","PTR_FORMAT","PTR_FORMAT"]" |
56 #define HR_FORMAT_PARAMS(_hr_) \ | |
57 (_hr_)->hrs_index(), \ | |
58 (_hr_)->is_survivor() ? "S" : (_hr_)->is_young() ? "E" : "-", \ | |
59 (_hr_)->bottom(), (_hr_)->top(), (_hr_)->end() | |
342 | 60 |
61 // A dirty card to oop closure for heap regions. It | |
62 // knows how to get the G1 heap and how to use the bitmap | |
63 // in the concurrent marker used by G1 to filter remembered | |
64 // sets. | |
65 | |
66 class HeapRegionDCTOC : public ContiguousSpaceDCTOC { | |
67 public: | |
68 // Specification of possible DirtyCardToOopClosure filtering. | |
69 enum FilterKind { | |
70 NoFilterKind, | |
71 IntoCSFilterKind, | |
72 OutOfRegionFilterKind | |
73 }; | |
74 | |
75 protected: | |
76 HeapRegion* _hr; | |
77 FilterKind _fk; | |
78 G1CollectedHeap* _g1; | |
79 | |
80 void walk_mem_region_with_cl(MemRegion mr, | |
81 HeapWord* bottom, HeapWord* top, | |
82 OopClosure* cl); | |
83 | |
84 // We don't specialize this for FilteringClosure; filtering is handled by | |
85 // the "FilterKind" mechanism. But we provide this to avoid a compiler | |
86 // warning. | |
87 void walk_mem_region_with_cl(MemRegion mr, | |
88 HeapWord* bottom, HeapWord* top, | |
89 FilteringClosure* cl) { | |
90 HeapRegionDCTOC::walk_mem_region_with_cl(mr, bottom, top, | |
91 (OopClosure*)cl); | |
92 } | |
93 | |
94 // Get the actual top of the area on which the closure will | |
95 // operate, given where the top is assumed to be (the end of the | |
96 // memory region passed to do_MemRegion) and where the object | |
97 // at the top is assumed to start. For example, an object may | |
98 // start at the top but actually extend past the assumed top, | |
99 // in which case the top becomes the end of the object. | |
100 HeapWord* get_actual_top(HeapWord* top, HeapWord* top_obj) { | |
101 return ContiguousSpaceDCTOC::get_actual_top(top, top_obj); | |
102 } | |
103 | |
104 // Walk the given memory region from bottom to (actual) top | |
105 // looking for objects and applying the oop closure (_cl) to | |
106 // them. The base implementation of this treats the area as | |
107 // blocks, where a block may or may not be an object. Sub- | |
108 // classes should override this to provide more accurate | |
109 // or possibly more efficient walking. | |
110 void walk_mem_region(MemRegion mr, HeapWord* bottom, HeapWord* top) { | |
111 Filtering_DCTOC::walk_mem_region(mr, bottom, top); | |
112 } | |
113 | |
114 public: | |
115 HeapRegionDCTOC(G1CollectedHeap* g1, | |
116 HeapRegion* hr, OopClosure* cl, | |
117 CardTableModRefBS::PrecisionStyle precision, | |
118 FilterKind fk); | |
119 }; | |
120 | |
121 // The complicating factor is that BlockOffsetTable diverged | |
122 // significantly, and we need functionality that is only in the G1 version. | |
123 // So I copied that code, which led to an alternate G1 version of | |
124 // OffsetTableContigSpace. If the two versions of BlockOffsetTable could | |
125 // be reconciled, then G1OffsetTableContigSpace could go away. | |
126 | |
127 // The idea behind time stamps is the following. Doing a save_marks on | |
128 // all regions at every GC pause is time consuming (if I remember | |
129 // well, 10ms or so). So, we would like to do that only for regions | |
130 // that are GC alloc regions. To achieve this, we use time | |
131 // stamps. For every evacuation pause, G1CollectedHeap generates a | |
132 // unique time stamp (essentially a counter that gets | |
133 // incremented). Every time we want to call save_marks on a region, | |
134 // we set the saved_mark_word to top and also copy the current GC | |
135 // time stamp to the time stamp field of the space. Reading the | |
136 // saved_mark_word involves checking the time stamp of the | |
137 // region. If it is the same as the current GC time stamp, then we | |
138 // can safely read the saved_mark_word field, as it is valid. If the | |
139 // time stamp of the region is not the same as the current GC time | |
140 // stamp, then we instead read top, as the saved_mark_word field is | |
141 // invalid. Time stamps (on the regions and also on the | |
142 // G1CollectedHeap) are reset at every cleanup (we iterate over | |
143 // the regions anyway) and at the end of a Full GC. The current scheme | |
144 // that uses sequential unsigned ints will fail only if we have 4b | |
145 // evacuation pauses between two cleanups, which is _highly_ unlikely. | |
146 | |
147 class G1OffsetTableContigSpace: public ContiguousSpace { | |
148 friend class VMStructs; | |
149 protected: | |
150 G1BlockOffsetArrayContigSpace _offsets; | |
151 Mutex _par_alloc_lock; | |
152 volatile unsigned _gc_time_stamp; | |
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153 // When we need to retire an allocation region, while other threads |
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154 // are also concurrently trying to allocate into it, we typically |
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155 // allocate a dummy object at the end of the region to ensure that |
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156 // no more allocations can take place in it. However, sometimes we |
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157 // want to know where the end of the last "real" object we allocated |
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158 // into the region was and this is what this keeps track. |
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159 HeapWord* _pre_dummy_top; |
342 | 160 |
161 public: | |
162 // Constructor. If "is_zeroed" is true, the MemRegion "mr" may be | |
163 // assumed to contain zeros. | |
164 G1OffsetTableContigSpace(G1BlockOffsetSharedArray* sharedOffsetArray, | |
165 MemRegion mr, bool is_zeroed = false); | |
166 | |
167 void set_bottom(HeapWord* value); | |
168 void set_end(HeapWord* value); | |
169 | |
170 virtual HeapWord* saved_mark_word() const; | |
171 virtual void set_saved_mark(); | |
172 void reset_gc_time_stamp() { _gc_time_stamp = 0; } | |
173 | |
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174 // See the comment above in the declaration of _pre_dummy_top for an |
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175 // explanation of what it is. |
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176 void set_pre_dummy_top(HeapWord* pre_dummy_top) { |
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177 assert(is_in(pre_dummy_top) && pre_dummy_top <= top(), "pre-condition"); |
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178 _pre_dummy_top = pre_dummy_top; |
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179 } |
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180 HeapWord* pre_dummy_top() { |
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181 return (_pre_dummy_top == NULL) ? top() : _pre_dummy_top; |
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182 } |
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183 void reset_pre_dummy_top() { _pre_dummy_top = NULL; } |
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184 |
356 | 185 virtual void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
186 virtual void clear(bool mangle_space); | |
342 | 187 |
188 HeapWord* block_start(const void* p); | |
189 HeapWord* block_start_const(const void* p) const; | |
190 | |
191 // Add offset table update. | |
192 virtual HeapWord* allocate(size_t word_size); | |
193 HeapWord* par_allocate(size_t word_size); | |
194 | |
195 // MarkSweep support phase3 | |
196 virtual HeapWord* initialize_threshold(); | |
197 virtual HeapWord* cross_threshold(HeapWord* start, HeapWord* end); | |
198 | |
199 virtual void print() const; | |
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200 |
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201 void reset_bot() { |
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202 _offsets.zero_bottom_entry(); |
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203 _offsets.initialize_threshold(); |
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204 } |
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205 |
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206 void update_bot_for_object(HeapWord* start, size_t word_size) { |
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207 _offsets.alloc_block(start, word_size); |
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208 } |
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209 |
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210 void print_bot_on(outputStream* out) { |
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211 _offsets.print_on(out); |
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212 } |
342 | 213 }; |
214 | |
215 class HeapRegion: public G1OffsetTableContigSpace { | |
216 friend class VMStructs; | |
217 private: | |
218 | |
355 | 219 enum HumongousType { |
220 NotHumongous = 0, | |
221 StartsHumongous, | |
222 ContinuesHumongous | |
223 }; | |
224 | |
342 | 225 // Requires that the region "mr" be dense with objects, and begin and end |
226 // with an object. | |
227 void oops_in_mr_iterate(MemRegion mr, OopClosure* cl); | |
228 | |
229 // The remembered set for this region. | |
230 // (Might want to make this "inline" later, to avoid some alloc failure | |
231 // issues.) | |
232 HeapRegionRemSet* _rem_set; | |
233 | |
234 G1BlockOffsetArrayContigSpace* offsets() { return &_offsets; } | |
235 | |
236 protected: | |
3766 | 237 // The index of this region in the heap region sequence. |
238 size_t _hrs_index; | |
342 | 239 |
355 | 240 HumongousType _humongous_type; |
342 | 241 // For a humongous region, region in which it starts. |
242 HeapRegion* _humongous_start_region; | |
243 // For the start region of a humongous sequence, it's original end(). | |
244 HeapWord* _orig_end; | |
245 | |
246 // True iff the region is in current collection_set. | |
247 bool _in_collection_set; | |
248 | |
249 // True iff an attempt to evacuate an object in the region failed. | |
250 bool _evacuation_failed; | |
251 | |
252 // A heap region may be a member one of a number of special subsets, each | |
253 // represented as linked lists through the field below. Currently, these | |
254 // sets include: | |
255 // The collection set. | |
256 // The set of allocation regions used in a collection pause. | |
257 // Spaces that may contain gray objects. | |
258 HeapRegion* _next_in_special_set; | |
259 | |
260 // next region in the young "generation" region set | |
261 HeapRegion* _next_young_region; | |
262 | |
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263 // Next region whose cards need cleaning |
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264 HeapRegion* _next_dirty_cards_region; |
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265 |
2152 | 266 // Fields used by the HeapRegionSetBase class and subclasses. |
267 HeapRegion* _next; | |
268 #ifdef ASSERT | |
269 HeapRegionSetBase* _containing_set; | |
270 #endif // ASSERT | |
271 bool _pending_removal; | |
272 | |
342 | 273 // For parallel heapRegion traversal. |
274 jint _claimed; | |
275 | |
276 // We use concurrent marking to determine the amount of live data | |
277 // in each heap region. | |
278 size_t _prev_marked_bytes; // Bytes known to be live via last completed marking. | |
279 size_t _next_marked_bytes; // Bytes known to be live via in-progress marking. | |
280 | |
281 // See "sort_index" method. -1 means is not in the array. | |
282 int _sort_index; | |
283 | |
284 // <PREDICTION> | |
285 double _gc_efficiency; | |
286 // </PREDICTION> | |
287 | |
288 enum YoungType { | |
289 NotYoung, // a region is not young | |
290 Young, // a region is young | |
3766 | 291 Survivor // a region is young and it contains survivors |
342 | 292 }; |
293 | |
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294 volatile YoungType _young_type; |
342 | 295 int _young_index_in_cset; |
296 SurvRateGroup* _surv_rate_group; | |
297 int _age_index; | |
298 | |
299 // The start of the unmarked area. The unmarked area extends from this | |
300 // word until the top and/or end of the region, and is the part | |
301 // of the region for which no marking was done, i.e. objects may | |
302 // have been allocated in this part since the last mark phase. | |
303 // "prev" is the top at the start of the last completed marking. | |
304 // "next" is the top at the start of the in-progress marking (if any.) | |
305 HeapWord* _prev_top_at_mark_start; | |
306 HeapWord* _next_top_at_mark_start; | |
307 // If a collection pause is in progress, this is the top at the start | |
308 // of that pause. | |
309 | |
310 // We've counted the marked bytes of objects below here. | |
311 HeapWord* _top_at_conc_mark_count; | |
312 | |
313 void init_top_at_mark_start() { | |
314 assert(_prev_marked_bytes == 0 && | |
315 _next_marked_bytes == 0, | |
316 "Must be called after zero_marked_bytes."); | |
317 HeapWord* bot = bottom(); | |
318 _prev_top_at_mark_start = bot; | |
319 _next_top_at_mark_start = bot; | |
320 _top_at_conc_mark_count = bot; | |
321 } | |
322 | |
323 void set_young_type(YoungType new_type) { | |
324 //assert(_young_type != new_type, "setting the same type" ); | |
325 // TODO: add more assertions here | |
326 _young_type = new_type; | |
327 } | |
328 | |
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329 // Cached attributes used in the collection set policy information |
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330 |
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331 // The RSet length that was added to the total value |
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332 // for the collection set. |
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333 size_t _recorded_rs_length; |
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334 |
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335 // The predicted elapsed time that was added to total value |
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336 // for the collection set. |
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337 double _predicted_elapsed_time_ms; |
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338 |
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339 // The predicted number of bytes to copy that was added to |
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340 // the total value for the collection set. |
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341 size_t _predicted_bytes_to_copy; |
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342 |
342 | 343 public: |
344 // If "is_zeroed" is "true", the region "mr" can be assumed to contain zeros. | |
3766 | 345 HeapRegion(size_t hrs_index, |
346 G1BlockOffsetSharedArray* sharedOffsetArray, | |
342 | 347 MemRegion mr, bool is_zeroed); |
348 | |
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349 static int LogOfHRGrainBytes; |
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350 static int LogOfHRGrainWords; |
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351 |
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352 static size_t GrainBytes; |
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353 static size_t GrainWords; |
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354 static size_t CardsPerRegion; |
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355 |
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356 static size_t align_up_to_region_byte_size(size_t sz) { |
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357 return (sz + (size_t) GrainBytes - 1) & |
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358 ~((1 << (size_t) LogOfHRGrainBytes) - 1); |
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359 } |
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360 |
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361 // It sets up the heap region size (GrainBytes / GrainWords), as |
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362 // well as other related fields that are based on the heap region |
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363 // size (LogOfHRGrainBytes / LogOfHRGrainWords / |
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364 // CardsPerRegion). All those fields are considered constant |
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365 // throughout the JVM's execution, therefore they should only be set |
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366 // up once during initialization time. |
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367 static void setup_heap_region_size(uintx min_heap_size); |
342 | 368 |
355 | 369 enum ClaimValues { |
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370 InitialClaimValue = 0, |
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371 FinalCountClaimValue = 1, |
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372 NoteEndClaimValue = 2, |
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373 ScrubRemSetClaimValue = 3, |
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374 ParVerifyClaimValue = 4, |
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375 RebuildRSClaimValue = 5, |
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376 CompleteMarkCSetClaimValue = 6, |
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377 ParEvacFailureClaimValue = 7, |
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378 AggregateCountClaimValue = 8, |
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379 VerifyCountClaimValue = 9 |
355 | 380 }; |
381 | |
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382 inline HeapWord* par_allocate_no_bot_updates(size_t word_size) { |
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383 assert(is_young(), "we can only skip BOT updates on young regions"); |
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384 return ContiguousSpace::par_allocate(word_size); |
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385 } |
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386 inline HeapWord* allocate_no_bot_updates(size_t word_size) { |
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387 assert(is_young(), "we can only skip BOT updates on young regions"); |
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388 return ContiguousSpace::allocate(word_size); |
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389 } |
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390 |
342 | 391 // If this region is a member of a HeapRegionSeq, the index in that |
392 // sequence, otherwise -1. | |
3766 | 393 size_t hrs_index() const { return _hrs_index; } |
342 | 394 |
395 // The number of bytes marked live in the region in the last marking phase. | |
396 size_t marked_bytes() { return _prev_marked_bytes; } | |
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397 size_t live_bytes() { |
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398 return (top() - prev_top_at_mark_start()) * HeapWordSize + marked_bytes(); |
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399 } |
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400 |
342 | 401 // The number of bytes counted in the next marking. |
402 size_t next_marked_bytes() { return _next_marked_bytes; } | |
403 // The number of bytes live wrt the next marking. | |
404 size_t next_live_bytes() { | |
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405 return |
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406 (top() - next_top_at_mark_start()) * HeapWordSize + next_marked_bytes(); |
342 | 407 } |
408 | |
409 // A lower bound on the amount of garbage bytes in the region. | |
410 size_t garbage_bytes() { | |
411 size_t used_at_mark_start_bytes = | |
412 (prev_top_at_mark_start() - bottom()) * HeapWordSize; | |
413 assert(used_at_mark_start_bytes >= marked_bytes(), | |
414 "Can't mark more than we have."); | |
415 return used_at_mark_start_bytes - marked_bytes(); | |
416 } | |
417 | |
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418 // Return the amount of bytes we'll reclaim if we collect this |
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419 // region. This includes not only the known garbage bytes in the |
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420 // region but also any unallocated space in it, i.e., [top, end), |
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421 // since it will also be reclaimed if we collect the region. |
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422 size_t reclaimable_bytes() { |
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423 size_t known_live_bytes = live_bytes(); |
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424 assert(known_live_bytes <= capacity(), "sanity"); |
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425 return capacity() - known_live_bytes; |
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426 } |
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427 |
342 | 428 // An upper bound on the number of live bytes in the region. |
429 size_t max_live_bytes() { return used() - garbage_bytes(); } | |
430 | |
431 void add_to_marked_bytes(size_t incr_bytes) { | |
432 _next_marked_bytes = _next_marked_bytes + incr_bytes; | |
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433 assert(_next_marked_bytes <= used(), "invariant" ); |
342 | 434 } |
435 | |
436 void zero_marked_bytes() { | |
437 _prev_marked_bytes = _next_marked_bytes = 0; | |
438 } | |
439 | |
355 | 440 bool isHumongous() const { return _humongous_type != NotHumongous; } |
441 bool startsHumongous() const { return _humongous_type == StartsHumongous; } | |
442 bool continuesHumongous() const { return _humongous_type == ContinuesHumongous; } | |
342 | 443 // For a humongous region, region in which it starts. |
444 HeapRegion* humongous_start_region() const { | |
445 return _humongous_start_region; | |
446 } | |
447 | |
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448 // Same as Space::is_in_reserved, but will use the original size of the region. |
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449 // The original size is different only for start humongous regions. They get |
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450 // their _end set up to be the end of the last continues region of the |
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451 // corresponding humongous object. |
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452 bool is_in_reserved_raw(const void* p) const { |
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453 return _bottom <= p && p < _orig_end; |
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454 } |
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455 |
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456 // Makes the current region be a "starts humongous" region, i.e., |
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457 // the first region in a series of one or more contiguous regions |
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458 // that will contain a single "humongous" object. The two parameters |
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459 // are as follows: |
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460 // |
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461 // new_top : The new value of the top field of this region which |
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462 // points to the end of the humongous object that's being |
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463 // allocated. If there is more than one region in the series, top |
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464 // will lie beyond this region's original end field and on the last |
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465 // region in the series. |
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466 // |
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467 // new_end : The new value of the end field of this region which |
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468 // points to the end of the last region in the series. If there is |
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469 // one region in the series (namely: this one) end will be the same |
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470 // as the original end of this region. |
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471 // |
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472 // Updating top and end as described above makes this region look as |
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473 // if it spans the entire space taken up by all the regions in the |
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474 // series and an single allocation moved its top to new_top. This |
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475 // ensures that the space (capacity / allocated) taken up by all |
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476 // humongous regions can be calculated by just looking at the |
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477 // "starts humongous" regions and by ignoring the "continues |
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478 // humongous" regions. |
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479 void set_startsHumongous(HeapWord* new_top, HeapWord* new_end); |
342 | 480 |
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481 // Makes the current region be a "continues humongous' |
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482 // region. first_hr is the "start humongous" region of the series |
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483 // which this region will be part of. |
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484 void set_continuesHumongous(HeapRegion* first_hr); |
342 | 485 |
2152 | 486 // Unsets the humongous-related fields on the region. |
487 void set_notHumongous(); | |
488 | |
342 | 489 // If the region has a remembered set, return a pointer to it. |
490 HeapRegionRemSet* rem_set() const { | |
491 return _rem_set; | |
492 } | |
493 | |
494 // True iff the region is in current collection_set. | |
495 bool in_collection_set() const { | |
496 return _in_collection_set; | |
497 } | |
498 void set_in_collection_set(bool b) { | |
499 _in_collection_set = b; | |
500 } | |
501 HeapRegion* next_in_collection_set() { | |
502 assert(in_collection_set(), "should only invoke on member of CS."); | |
503 assert(_next_in_special_set == NULL || | |
504 _next_in_special_set->in_collection_set(), | |
505 "Malformed CS."); | |
506 return _next_in_special_set; | |
507 } | |
508 void set_next_in_collection_set(HeapRegion* r) { | |
509 assert(in_collection_set(), "should only invoke on member of CS."); | |
510 assert(r == NULL || r->in_collection_set(), "Malformed CS."); | |
511 _next_in_special_set = r; | |
512 } | |
513 | |
2152 | 514 // Methods used by the HeapRegionSetBase class and subclasses. |
342 | 515 |
2152 | 516 // Getter and setter for the next field used to link regions into |
517 // linked lists. | |
518 HeapRegion* next() { return _next; } | |
519 | |
520 void set_next(HeapRegion* next) { _next = next; } | |
342 | 521 |
2152 | 522 // Every region added to a set is tagged with a reference to that |
523 // set. This is used for doing consistency checking to make sure that | |
524 // the contents of a set are as they should be and it's only | |
525 // available in non-product builds. | |
526 #ifdef ASSERT | |
527 void set_containing_set(HeapRegionSetBase* containing_set) { | |
528 assert((containing_set == NULL && _containing_set != NULL) || | |
529 (containing_set != NULL && _containing_set == NULL), | |
530 err_msg("containing_set: "PTR_FORMAT" " | |
531 "_containing_set: "PTR_FORMAT, | |
532 containing_set, _containing_set)); | |
533 | |
534 _containing_set = containing_set; | |
2361 | 535 } |
342 | 536 |
2152 | 537 HeapRegionSetBase* containing_set() { return _containing_set; } |
538 #else // ASSERT | |
539 void set_containing_set(HeapRegionSetBase* containing_set) { } | |
342 | 540 |
2361 | 541 // containing_set() is only used in asserts so there's no reason |
2152 | 542 // to provide a dummy version of it. |
543 #endif // ASSERT | |
342 | 544 |
2152 | 545 // If we want to remove regions from a list in bulk we can simply tag |
546 // them with the pending_removal tag and call the | |
547 // remove_all_pending() method on the list. | |
342 | 548 |
2152 | 549 bool pending_removal() { return _pending_removal; } |
550 | |
551 void set_pending_removal(bool pending_removal) { | |
2361 | 552 if (pending_removal) { |
553 assert(!_pending_removal && containing_set() != NULL, | |
554 "can only set pending removal to true if it's false and " | |
555 "the region belongs to a region set"); | |
556 } else { | |
557 assert( _pending_removal && containing_set() == NULL, | |
558 "can only set pending removal to false if it's true and " | |
559 "the region does not belong to a region set"); | |
560 } | |
2152 | 561 |
562 _pending_removal = pending_removal; | |
342 | 563 } |
564 | |
565 HeapRegion* get_next_young_region() { return _next_young_region; } | |
566 void set_next_young_region(HeapRegion* hr) { | |
567 _next_young_region = hr; | |
568 } | |
569 | |
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570 HeapRegion* get_next_dirty_cards_region() const { return _next_dirty_cards_region; } |
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571 HeapRegion** next_dirty_cards_region_addr() { return &_next_dirty_cards_region; } |
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572 void set_next_dirty_cards_region(HeapRegion* hr) { _next_dirty_cards_region = hr; } |
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573 bool is_on_dirty_cards_region_list() const { return get_next_dirty_cards_region() != NULL; } |
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574 |
3766 | 575 HeapWord* orig_end() { return _orig_end; } |
576 | |
342 | 577 // Allows logical separation between objects allocated before and after. |
578 void save_marks(); | |
579 | |
580 // Reset HR stuff to default values. | |
581 void hr_clear(bool par, bool clear_space); | |
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582 void par_clear(); |
342 | 583 |
356 | 584 void initialize(MemRegion mr, bool clear_space, bool mangle_space); |
342 | 585 |
586 // Get the start of the unmarked area in this region. | |
587 HeapWord* prev_top_at_mark_start() const { return _prev_top_at_mark_start; } | |
588 HeapWord* next_top_at_mark_start() const { return _next_top_at_mark_start; } | |
589 | |
590 // Apply "cl->do_oop" to (the addresses of) all reference fields in objects | |
591 // allocated in the current region before the last call to "save_mark". | |
592 void oop_before_save_marks_iterate(OopClosure* cl); | |
593 | |
594 // Note the start or end of marking. This tells the heap region | |
595 // that the collector is about to start or has finished (concurrently) | |
596 // marking the heap. | |
597 | |
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598 // Notify the region that concurrent marking is starting. Initialize |
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599 // all fields related to the next marking info. |
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600 inline void note_start_of_marking(); |
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601 |
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602 // Notify the region that concurrent marking has finished. Copy the |
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603 // (now finalized) next marking info fields into the prev marking |
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604 // info fields. |
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605 inline void note_end_of_marking(); |
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606 |
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607 // Notify the region that it will be used as to-space during a GC |
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608 // and we are about to start copying objects into it. |
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609 inline void note_start_of_copying(bool during_initial_mark); |
342 | 610 |
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611 // Notify the region that it ceases being to-space during a GC and |
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612 // we will not copy objects into it any more. |
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613 inline void note_end_of_copying(bool during_initial_mark); |
342 | 614 |
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615 // Notify the region that we are about to start processing |
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616 // self-forwarded objects during evac failure handling. |
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617 void note_self_forwarding_removal_start(bool during_initial_mark, |
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618 bool during_conc_mark); |
342 | 619 |
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620 // Notify the region that we have finished processing self-forwarded |
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621 // objects during evac failure handling. |
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622 void note_self_forwarding_removal_end(bool during_initial_mark, |
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623 bool during_conc_mark, |
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624 size_t marked_bytes); |
342 | 625 |
626 // Returns "false" iff no object in the region was allocated when the | |
627 // last mark phase ended. | |
628 bool is_marked() { return _prev_top_at_mark_start != bottom(); } | |
629 | |
630 // If "is_marked()" is true, then this is the index of the region in | |
631 // an array constructed at the end of marking of the regions in a | |
632 // "desirability" order. | |
633 int sort_index() { | |
634 return _sort_index; | |
635 } | |
636 void set_sort_index(int i) { | |
637 _sort_index = i; | |
638 } | |
639 | |
640 void init_top_at_conc_mark_count() { | |
641 _top_at_conc_mark_count = bottom(); | |
642 } | |
643 | |
644 void set_top_at_conc_mark_count(HeapWord *cur) { | |
645 assert(bottom() <= cur && cur <= end(), "Sanity."); | |
646 _top_at_conc_mark_count = cur; | |
647 } | |
648 | |
649 HeapWord* top_at_conc_mark_count() { | |
650 return _top_at_conc_mark_count; | |
651 } | |
652 | |
653 void reset_during_compaction() { | |
654 guarantee( isHumongous() && startsHumongous(), | |
655 "should only be called for humongous regions"); | |
656 | |
657 zero_marked_bytes(); | |
658 init_top_at_mark_start(); | |
659 } | |
660 | |
661 void calc_gc_efficiency(void); | |
662 double gc_efficiency() { return _gc_efficiency;} | |
663 | |
664 bool is_young() const { return _young_type != NotYoung; } | |
665 bool is_survivor() const { return _young_type == Survivor; } | |
666 | |
667 int young_index_in_cset() const { return _young_index_in_cset; } | |
668 void set_young_index_in_cset(int index) { | |
669 assert( (index == -1) || is_young(), "pre-condition" ); | |
670 _young_index_in_cset = index; | |
671 } | |
672 | |
673 int age_in_surv_rate_group() { | |
674 assert( _surv_rate_group != NULL, "pre-condition" ); | |
675 assert( _age_index > -1, "pre-condition" ); | |
676 return _surv_rate_group->age_in_group(_age_index); | |
677 } | |
678 | |
679 void record_surv_words_in_group(size_t words_survived) { | |
680 assert( _surv_rate_group != NULL, "pre-condition" ); | |
681 assert( _age_index > -1, "pre-condition" ); | |
682 int age_in_group = age_in_surv_rate_group(); | |
683 _surv_rate_group->record_surviving_words(age_in_group, words_survived); | |
684 } | |
685 | |
686 int age_in_surv_rate_group_cond() { | |
687 if (_surv_rate_group != NULL) | |
688 return age_in_surv_rate_group(); | |
689 else | |
690 return -1; | |
691 } | |
692 | |
693 SurvRateGroup* surv_rate_group() { | |
694 return _surv_rate_group; | |
695 } | |
696 | |
697 void install_surv_rate_group(SurvRateGroup* surv_rate_group) { | |
698 assert( surv_rate_group != NULL, "pre-condition" ); | |
699 assert( _surv_rate_group == NULL, "pre-condition" ); | |
700 assert( is_young(), "pre-condition" ); | |
701 | |
702 _surv_rate_group = surv_rate_group; | |
703 _age_index = surv_rate_group->next_age_index(); | |
704 } | |
705 | |
706 void uninstall_surv_rate_group() { | |
707 if (_surv_rate_group != NULL) { | |
708 assert( _age_index > -1, "pre-condition" ); | |
709 assert( is_young(), "pre-condition" ); | |
710 | |
711 _surv_rate_group = NULL; | |
712 _age_index = -1; | |
713 } else { | |
714 assert( _age_index == -1, "pre-condition" ); | |
715 } | |
716 } | |
717 | |
718 void set_young() { set_young_type(Young); } | |
719 | |
720 void set_survivor() { set_young_type(Survivor); } | |
721 | |
722 void set_not_young() { set_young_type(NotYoung); } | |
723 | |
724 // Determine if an object has been allocated since the last | |
725 // mark performed by the collector. This returns true iff the object | |
726 // is within the unmarked area of the region. | |
727 bool obj_allocated_since_prev_marking(oop obj) const { | |
728 return (HeapWord *) obj >= prev_top_at_mark_start(); | |
729 } | |
730 bool obj_allocated_since_next_marking(oop obj) const { | |
731 return (HeapWord *) obj >= next_top_at_mark_start(); | |
732 } | |
733 | |
734 // For parallel heapRegion traversal. | |
735 bool claimHeapRegion(int claimValue); | |
736 jint claim_value() { return _claimed; } | |
737 // Use this carefully: only when you're sure no one is claiming... | |
738 void set_claim_value(int claimValue) { _claimed = claimValue; } | |
739 | |
740 // Returns the "evacuation_failed" property of the region. | |
741 bool evacuation_failed() { return _evacuation_failed; } | |
742 | |
743 // Sets the "evacuation_failed" property of the region. | |
744 void set_evacuation_failed(bool b) { | |
745 _evacuation_failed = b; | |
746 | |
747 if (b) { | |
748 init_top_at_conc_mark_count(); | |
749 _next_marked_bytes = 0; | |
750 } | |
751 } | |
752 | |
753 // Requires that "mr" be entirely within the region. | |
754 // Apply "cl->do_object" to all objects that intersect with "mr". | |
755 // If the iteration encounters an unparseable portion of the region, | |
756 // or if "cl->abort()" is true after a closure application, | |
757 // terminate the iteration and return the address of the start of the | |
758 // subregion that isn't done. (The two can be distinguished by querying | |
759 // "cl->abort()".) Return of "NULL" indicates that the iteration | |
760 // completed. | |
761 HeapWord* | |
762 object_iterate_mem_careful(MemRegion mr, ObjectClosure* cl); | |
763 | |
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764 // filter_young: if true and the region is a young region then we |
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765 // skip the iteration. |
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766 // card_ptr: if not NULL, and we decide that the card is not young |
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767 // and we iterate over it, we'll clean the card before we start the |
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768 // iteration. |
342 | 769 HeapWord* |
770 oops_on_card_seq_iterate_careful(MemRegion mr, | |
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771 FilterOutOfRegionClosure* cl, |
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772 bool filter_young, |
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773 jbyte* card_ptr); |
342 | 774 |
775 // A version of block start that is guaranteed to find *some* block | |
776 // boundary at or before "p", but does not object iteration, and may | |
777 // therefore be used safely when the heap is unparseable. | |
778 HeapWord* block_start_careful(const void* p) const { | |
779 return _offsets.block_start_careful(p); | |
780 } | |
781 | |
782 // Requires that "addr" is within the region. Returns the start of the | |
783 // first ("careful") block that starts at or after "addr", or else the | |
784 // "end" of the region if there is no such block. | |
785 HeapWord* next_block_start_careful(HeapWord* addr); | |
786 | |
1394
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787 size_t recorded_rs_length() const { return _recorded_rs_length; } |
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788 double predicted_elapsed_time_ms() const { return _predicted_elapsed_time_ms; } |
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789 size_t predicted_bytes_to_copy() const { return _predicted_bytes_to_copy; } |
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790 |
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791 void set_recorded_rs_length(size_t rs_length) { |
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792 _recorded_rs_length = rs_length; |
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793 } |
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794 |
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795 void set_predicted_elapsed_time_ms(double ms) { |
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796 _predicted_elapsed_time_ms = ms; |
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797 } |
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798 |
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799 void set_predicted_bytes_to_copy(size_t bytes) { |
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800 _predicted_bytes_to_copy = bytes; |
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801 } |
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802 |
342 | 803 #define HeapRegion_OOP_SINCE_SAVE_MARKS_DECL(OopClosureType, nv_suffix) \ |
804 virtual void oop_since_save_marks_iterate##nv_suffix(OopClosureType* cl); | |
805 SPECIALIZED_SINCE_SAVE_MARKS_CLOSURES(HeapRegion_OOP_SINCE_SAVE_MARKS_DECL) | |
806 | |
807 CompactibleSpace* next_compaction_space() const; | |
808 | |
809 virtual void reset_after_compaction(); | |
810 | |
811 void print() const; | |
812 void print_on(outputStream* st) const; | |
813 | |
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814 // vo == UsePrevMarking -> use "prev" marking information, |
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815 // vo == UseNextMarking -> use "next" marking information |
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816 // vo == UseMarkWord -> use the mark word in the object header |
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817 // |
811 | 818 // NOTE: Only the "prev" marking information is guaranteed to be |
819 // consistent most of the time, so most calls to this should use | |
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820 // vo == UsePrevMarking. |
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821 // Currently, there is only one case where this is called with |
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822 // vo == UseNextMarking, which is to verify the "next" marking |
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823 // information at the end of remark. |
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824 // Currently there is only one place where this is called with |
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825 // vo == UseMarkWord, which is to verify the marking during a |
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826 // full GC. |
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827 void verify(bool allow_dirty, VerifyOption vo, bool *failures) const; |
811 | 828 |
829 // Override; it uses the "prev" marking information | |
342 | 830 virtual void verify(bool allow_dirty) const; |
831 }; | |
832 | |
833 // HeapRegionClosure is used for iterating over regions. | |
834 // Terminates the iteration when the "doHeapRegion" method returns "true". | |
835 class HeapRegionClosure : public StackObj { | |
836 friend class HeapRegionSeq; | |
837 friend class G1CollectedHeap; | |
838 | |
839 bool _complete; | |
840 void incomplete() { _complete = false; } | |
841 | |
842 public: | |
843 HeapRegionClosure(): _complete(true) {} | |
844 | |
845 // Typically called on each region until it returns true. | |
846 virtual bool doHeapRegion(HeapRegion* r) = 0; | |
847 | |
848 // True after iteration if the closure was applied to all heap regions | |
849 // and returned "false" in all cases. | |
850 bool complete() { return _complete; } | |
851 }; | |
852 | |
853 #endif // SERIALGC | |
1972 | 854 |
855 #endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGION_HPP |